alfred marshall was high on this idea 120 years ago. i'm less optimistic about his vision for competitiveness in the inner city. i think actually there was probably too much of an emphasis on what their current comparative advantage is relative to thinking of game-changing things and radically increase the human capital in areas. i think that's the fundamental thing. it's not figuring out how to do low value added services, but how to provide the skills and connections that enable the areas to grow. of course, there's a whole 80% of the book about things unrelated to mai coal porter's core interest, but certainly i share his enthew yasm for entrepreneurship and connecting with people in dense corridors. >> let's go over here. >> hi. the cover of your book has a picture of chicago, i think? >> it is, stretched out. >> anyone who been to chicago lately knows it looks amazing. it's clean, clean parks, and the census said chicago lost 200,000 people in the last 10 years, and at the same time, the exurban counties away from chicago were some